Example of Scala collection to Java 8 Stream from within Java.

Also added a unit test to make sure the example compiles.

Author: Ichoran

src/test/java/scala/compat/java8/StreamConvertersExampleTest.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2016 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+import org.junit.Test;
+
+import scala.collection.mutable.ArrayBuffer;
+import scala.compat.java8.ScalaStreaming;
+
+
+public class StreamConvertersExampleTest {
+  @Test
+  public void MakeAndUseArrayBuffer() {
+    ArrayBuffer<String> ab = new ArrayBuffer<String>();
+    ab.$plus$eq("salmon");
+    ab.$plus$eq("herring");
+    assert( ScalaStreaming.from(ab).mapToInt(x -> x.length()).sum() == 13 );
+  }
+}
+